Portable boring mill



July 14, 1953 M. BEAULOYE EI'AL 2,645,139

PORTABLE BORING MILL Filed Dec. 27, 1949 2 Sheets-Sheet 1 HENRY BEAULOYE'JR. 6 BY ALFRED EsEAuLor! AGENT b M... M 6 e c 3 5 mm 2 2 5 w P 0 MM A m 6 I m 2 H I a m m ///////\VNV\ m 2 iii lll F m v w I W y 14, 1953 M. BEAULOYE ETAL 2,645,139

- PORTABLE BORING MILL Filed Dec. 27, 1949 k ,1 lll llllllllllllllllh r 71 1Q l9b y) 2 Q l9c F A 4 INVENTORS 20' MAX BEAULOYE I I HENRY auuwre JR, a

y ALFRED E 0540mm AGENT Patented July 14, 1953 UNITED STATES PATENT OFFICE PORTABLE BORING MILL Max Beauloye, Henry Beauloye, J r., and Alfred F. Beauloye, San Diego, Calif.

Application December 27, 1949, Serial No. 135,264

8 Claims.

Our invention relates to a portable boring mill, and the objects of our invention are:

First, to provide a portable boring mill of this class which is arranged to be stabilized in alignment with the axis of an engine cylinder by means of the crankshaft of the engine in which the cylinders are being bored;

second, to provide a portable boring mill of this class which may be used to bore large diameter engine cylinders in a limited amount of space or in close quarters within an engine room without removing the engine from its mounts;

Third, to provide a portable boring mill of this class which saves transportation and assembly costs on large engines which require cylinder reboring;

Fourth, to provide a portable boring mill of this class which employs the engine crankshaft as a stabilizer for the lower end of the boring bar, and employs fixtures at the upper end of the engine block for supporting the opposite end of the boring bar, whereby very accurate alignment of the boring axis of our portable boring mill is had relative to the axis of the original cylinders;

Fifth, to provide a portable boring mill of this class which will serve in a machine shop for the purpose of performing various boring mill functions;

Sixth, to provide a portable boring mill of this class which may be used in a lathe;

Seventh, to provide a portable boring mill of this class which is very light in weight in proportion to the large size of cylinders it is capable of boring;

Eighth, to provide a portable boring mill of this class which is particularly adapted for use in boring the cylinders of large boat engines without removing the same;

Ninth, to provide a boring mill of this class having a constantfeed and fast lead screw return during the normal rotational direction of the boring bar;

Tenth, to provide a portable boring mill of this class having a bearing fixture engageable with a journal of an engine crankshaft which is provided with a V-block portion engageable with the entire length of the journal, whereby ninety degree alignment with the crankshaft journal is provided, so that the axis of the cylinder being rebored will be precisely ninety degrees to the axis of the engine crankshaft;

Eleventh, to provide a portable boring mill of this class having the nut and lead screw internally of the boring bar, whereby it is protected 2 from abrasion and various foreign matter, such as chips or the like; and

Twelfth, to provide a portable boring mill of this class which is very simple and economical of construction in proportion to its utility, very efficient, and which will not readily deteriorate or get out of order.

With these and other objects in view, as will appear hereinafter, our invention consists of certain novel features of construction, combination and arrangement of parts and portions, as will be hereinafter described in detail and particularly set forth in the appended claims, reference being had to theaccompanying drawings and to the characters of reference thereon, forming a part of this application, in which:

Fig. l is a side elevational view of our portable boring mill, shown in an engine cylinder, which is illustrated by dash lines, and shown fixed to the crankshaft of an engine, also illustrated by dash lines; Fig. 2 is an enlarged fragmentary sectional view, taken from the line 2-2 of Fig. 1, showing parts and portions in elevation to facilitate the illustration; Fig. 3 is an enlarged fragmentary sectional View, taken from the line 33 of Fig. 2; Fig. 4 is an enlarged plan sectional view, taken from the line 44 of Fig. 1, showing parts in elevation to facilitate the illustration; Fig. 5 is a fragmentary sectional View, taken from the line 5-5 of Fig. 4; and Fig. 6 is an enlarged fragmentary sectional view, taken from the line 6--6 of Fig, 1.

Similar characters of reference refer to similar parts and portions throughout the several views of the drawings.

The main bar I', bearings 2 and 3, bearing fixtures 4 and 5, tool carriage 6, tool holder 1, tool 8, key 9, lead screw it), lead screw nut ll, keys I2 and I3, bushings l4 and I5, collar 16, bearing retainer ll, bearing blocks l8 and I9, gears 20 and 2|, stop latches 22, 23 and 24, drive shaft 25, gear restraining shaft 26, cam 21, sheave 28, arm 29, bearing fixture supports 30, belt 3|, and the crankshaft-engaging chain 32, constitute the principal parts and portions of our portable boring mill.

The boring bar I is ahollow tubular member,

having a longitudinal slot la in its side wall, through which the key 9 extends. This key 9 is fixed to the tool carriage 6 by means of screws 6a, and the tool carriage 6, as shown in Figs. 1 and 4 of the drawings, is a collar-shaped hollow cylindrical member surrounding the main bar l, and j provided with a fixture 6b in which the tool holder 1 is slidably mounted and fixed by means of a key 60 and set screw 611. It will be noted that the key 60 and set screw 6d serve to fix the tool holder I in the laterally disposed opening Be in the fixture 61), so that the tool holder I extends at right angles to the axis of the main bar I, and supports the removable tool 8, which is a conventional cutting tool.

Screw-threaded in the inner end of the tool holder I is an adjustment screw Ia, which provides for the radial adjustment of the tool 3 together with the holder 1, for setting the same to a predetermined cutting diameter for boring a certain sized hole or cylinder. Fixed in the normally upper end of the main bar I is a bearing block I8, in which the pressed bushing I5 supports the collar I 6, fixed to the outer side of the lead screw I0, whereby the collar I6 provides a bearing within the bushing I5 for rotation of the lead screw within the bearing block I8. This bearing block I8 is fixed to the main bar I by means of screws IBa, which also serve as connection screws for the main bar I and the drive shaft 25, which is a hollow drive shaft having an enlarged hollow portion a and reduced hollow portion 251), n which the sheave 28 is fixed for driving or rotating the shaft 25 by means of the belt 3|, operating in connection with a motor which is not shown in the drawing and which is no part of ur present invention. The drive shaft 25 is supported in a self-aligning bearing 3, which in turn is supported in the bearing fixture 5, adapted to be secured in fixed relationship with the upper portion of an engine block, as illustrated by dash lines A in Fig. l of the drawings, by means of the bearing fixture supports 30.

These bearing fixture supports 30 are each provided with a hollow cylindrical portion 30a, having a split end portion 301), provided with an internally tapered threaded nut 300, which is adapted to cause contraction of the hollow cylindrical portion 30a around the studs 30d for holding the same in certain fixed elevated position. It will be noted that the normally lower ends of the tubular members 30a are provided with lugs 386, through which conventional studs extend for securing the same to the upper end of the engine block A. The normally upper ends of the studs 30d are provided with shoulder portions and nuts 30], which engage the bearing fixture 5 in which the selfaligning bearing 3 is supported, all as shown best in Figs. 1 and 2 of the drawings. a

The lower end of the main bar I is provided with a bearing block I8, fixed therein by means of the pins I9a, and this bearing block I9 is provided with a projecting stub I9b, on which the bearing 2 is positioned. This bearing 2 is retained in the bearing fixture 4, as shown in Fig. 6 of the drawings, by means of the bearing retainer H, which is fixed by screws I'Ia to the normally upper end of the bearing fixture 4. Screw threaded in the stub IQ?) of the bearing block I9 is a bolt I90, having an engaging washer I911, abutting the inner rotatable race 2a of the bearing 2, providing for the rotatable support of the normally lower end of the main bar I.

Fixed in the internal bore I9e of the bearing block I9 is the bushing I 4, which provides a bearing for the lower stub end Illa of the lead screw I0. It will be noted that the collar I5, secured to the lead screw I0 as hereinbefore described, is provided with an enlarged flange portion I Iia, which provides for the limitation of end play of the lead screw II] in one direction, while the nut IIlb' screw threaded on the normally upper end of the lead screw I0 at its reduced in diameter portion I00, maintains the shoulder I6a of the collar IS in its end play engagement with the end of the bushing I5. It will be noted that the threads of the nut IOb are substantially close tolerance threads, so that they fit the threads on the reduced shaft portion I0c very tightly.

It will be noted that the end of the bushing I4 surrounding the bearing stub Illa of the lead screw II] also provides for end play restriction of the lead screw I 0. The lead screw I0 is screwthreadably engaged by the traversing nut II, as shown best in Fig. 5 of the drawings. This traversing nut II is provided with external screw threads at its opposite ends, engaged by the internally screw threaded key nuts I2 and I3. These key nuts I2 and I3 engage the T- head portions 9a and 9b of the key 9, respectively, for securing the nut I I to the key 9, which is fixed, as hereinbefore described, to the carriage 6 by means of the screws 6a.

The bearing block I8, hereinbefore described, is provided with a radially disposed slot I8b, engageable with the stop latch 22, which is a reciprocally movable latch provided with a spring 22a, tending to urge the latch into the slot I8b for interlocking the rotary motion of the main bar I and the holder 20a of the internal spur gear 20. This internal spur gear 20 is substantially cup-shaped, and provided with a cam-engaging opening 20b, which engages the eccentric cam portion 21a of the cam 21, which is fixed to the shaft 2-5 by means of the pin 211). Fixed on the upper end of the shaft 26 is the arm 29.

It will be here noted that the nut Iflb hereinbefore described, is engaged by the cam member 21 at its normally upper surface, and that the lead screw ID, at its shoulder adjacent the reduced diameter portion I00, engages the cam portion 21a of the cam member 21 axially. As shown in Fig. 3, the cup-shaped internal spur gear 20 is disclosed wherein the bottom portion 200 thereof having the opening 29b, engages the eccentric cam portion 21a of the cam member 27, through which the reduced in diameter portion IIlc of the lead screw I0 extends.

The gear 2I is fixed to the lead screw I8 and is constantly in mesh with the internal spur gear 20. It will be noted that the gear 2I is substantially smaller in diameter than the gear 20, and actually has one tooth less than the gear 20, whereby one eccentric cycle of the gear holder 20a causes the lead screw I B to rotate an amount equal to one tooth of the gear 2I in advancement over the rotation of the main bar I. This is due to the fact that the gear 20, in constant mesh with the gear 2 I, is provided with one mor tooth than the gear 2 I.

The bearing fixture 4, at the normally lower end of the main bar I, as hereinbefore described, is provided with a V-block portion 4a, which is adapted to engage crankshaft connecting rod bearing journals as illustrated by dash lines B in Fig. 1 of the drawings, for supporting the main bar I in axial alignment with the cylinder bore A, as shown in Fig, 1 of the drawings. The V-block portion 4a of the bearing fixture 4 is precisely at right angles to the axis of the main bar I, as supported in the bearing 2, held by the bearing fixture 4. Thus, the axial disposition of the hearing journal B insures proper alignment of the main bar I in the cylinder A during reboring of the cylinder.

The operation of our portable boring mill is substantially as follows: When our portable boring mill is properly set up in an engine cylinder, as shown in Fig. l of the drawings, and engaged with the engine crankshaft, as hereinbefore described, reboring of the cylinder A may be accomplished. It is to be noted, however, that the bearing fixture 4 is secured to the journal 13 of the crankshaft of the engine when it is at top dead center position. This position is determined and set by a means which is no part of our present invention.

In setting up our portable boring mill on an engine block, the bearing fixture supports 39, as hereinbefore described, are secured in position for holding the bearing fixture 5, in which the bearing 3 is mounted for centrally supporting the upper end of the main bar I in the cylinder bore A. As the screw 32a of the chain 32 is tightened, the chain 32 forces the bearing fixture, at its V-block 4a, to intimately engage the connecting rod journal B of the engine crankshaft, which automatically aligns the axis of the main bar I at right angles with the journal B. Thus, when the portable boring bar is properly set up, as shown in Fig. 1 of the drawings and as hereinbefore described, the latch 22 is engaged with the slot I8b, as shown in Fig. 2 of the drawings, and a suitable motor is used to rotate the sheave 28,

currently rotating the main bar I, which, by

' means of the key 9, rotates the carriage 6 and lead screw nut II in unison. The carriage 6 carries the tool holder I, the cutting tool 8 concentrically bores the cylinder A, straightening it up and removing the tapertherefrom.

Preliminary setting of the tool 8 is accomplished radially by means of thescrew M, as hereinbefore described, to provide for a predetermined finish diameter of the cylinder core A. The arm 29, in connection with the shaft 26, is fixed against rotation by engaging the same with a stationary object in connection with the engine block, and the cam 2'! is thus maintained in stationary position, so that the eccentric portion 21a forms an eccentric bearing around which the bearing holder 223a oscillates, carrying the internal spur gear in oscillatory fashion around the spurgear 2|, which is fixed to the lead screw I0. For each oscillating eccentric cycle of the gear 20, the lead screw IE, by means of the gear 2I, is rotationally advanced in reverse of the main bar equal to one tooth of the gear 2 l, inasmuch as the gear 29 is provided with a tooth additional to the number on the gear 2 I.

Thus, the lead screw ill is constantly rotated slightly in advance of the rotational speed of the main bar I, whereby the lead screw I9 slowly advances the nut I I axially of the main bar I, moving the carriage progressively and uniformly longitudinally of the cylinder bore A during continuous rotation of the main bar I, which provides for a very smooth and progressively helical cutting finish inside the cylinder bore A.

It will be noted that the end 22b of the stop latch 22 reciprocates in the slot Iflb during oscillatory movement of the holder 25a of the internal spur gear 25. When it is desired to retract the carriage i5 upwardly, thelatch member 22 is released from the slot' I81 at its end 2217 and the latch 23 is reciprocated into engagement with the latch member 2 5, interlocking the stationary shaft 26 and the spur gear holder 20a. This causes stationary maintenance of the lead screw III by the gear 2| in mesh with the gear 20, which permits the nut I I to rotate about the lead screw II) at a very fast rate, due to the fact that the main bar I revolves the nut I I one complete revolution around the lead screw ID for each revo1ution of the main bar I. Thus, the carriage 6 is rapidly retracted upwardly longitudinally of the main bar I when the latch members 23 and 22 are engaged, and this, as hereinbefore described, is accomplished by continually rotating the main bar I in the same direction as it is normally rotated when feeding the carriage downwardly in the cylinder bore A and reboring the cylinders.

Though we have shown and described a particular construction, combination and arrangement of parts and portions, we do not wish-to be limited to this particular construction, combination and arrangement, but desire to include in the scope of our invention the construction, combination and arrangement substantially as set forth in the appended claims.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is: V

1. In a portable boring mill, a boring bar, bearings rotatably supporting said boring bar at each of its ends, a tool carriage longitudinally slidably mounted on said bar, said bar provided with a slot in its side wall, a key fixed to said carriage extending through said slot, a nut on the inner end of said key, a lead screw threadably engaged with said nut internally of said bar, a stationary cam, an eccentrically oscillating gear holder engaging said cam, an internal spur gear in said gear holder, and a second gear of smaller diameter in mesh with said internal spur gear and fixed to said lead screw.

2. In aportable boring mill, a boring bar, a bearing adapted to rotatably support said boring bar at each of its ends, a bearing fixture at the normally upper end of the boring bar to secure one of said hearings in fixed relationship with an engine cylinderbore, the otherof said bearings having a fixture engageable with an. engine crankshaft journal, said bearing fixture having means engageable with said journal for aligning the axis of said boring barat right angles to the axis of an engine crankshaft on which said journal is disposed, a tool carriage longitudinally slidably mounted onsaid bar, said bar provided with a slot in its side wall, a key fixed to said carriage extending through said slot, a, nut on the inner end of said key, a lead screw threadably engaged with said nut internally of said bar, means for rotating said bar in said bearings, a stationary cam, an eccentrically oscillating gear holder engaging said cam, an internal spur gear in said gear holder, and a second gear of smaller diameter in mesh with said internal spur gear and fixed to said lead screw.

3. In a portable boring mill, a boring bar, a bearing adapted to rotatably support said boring bar at each of its ends, a bearing fixture at the normally upper end of the boring bar to secure one of said bearings in fixed relationship with an engine cylinder bore, the other of said bearings having a fixture engageable with an engine crankshaft journal, said bearing fixture having means engageable with said journal for aligning the axis of said boring bar at right angles to the axis of an engine crankshaft on which said journal is disposed, a tool carriage longitudinally slidably mounted on said bar, said bar provided with a slot in its side wall, a key fixed to said car- 7 riage extending through said slot, a nut on the inner end of said key, a lead screw threadably engaged with said nut internally of said bar, means for rotating said bar in said bearings, a stationary cam, an eccentrically oscillating gear holder engaging said cam, an internal spur gear in said gear holder, and a second gear of smaller diameter in mesh with said internal spur gear and fixed to said lead screw, the eccentricity of said cam adapted to oscillate said gear holder equal to the radius difference between said gears.

4. In a portable boring mill, a boring bar, a bearing adapted to rotatably support said boring bar at each of its ends, a bearing fixture at the normally upper end of the boring bar to secure one of said bearings in fixed relationship with an engine cylinder bore, the other of said bearings having a fixture engageable with an engine crankshaft journal, said bearing fixture having means engageable with said journal for aligning the axis of said boring bar at right angles to the axis of an engine crankshaft on which said journal is disposed, a tool carriage longitudinally slidably mounted on said bar, said bar provided with a slot in its side wall, a key fixed to said carriage extending through said slot, a nut on the inner end of said key, a lead screw threadably engaged with said nut internally of said bar, means for rotating said bar in said bearings, a stationary cam, an eccentrically oscillating gear holder engaging said cam, an internal spur gear in said gear holder, and a second gear of smaller diameter in mesh with said internal spur gear and fixed to said lead screw, the eccentricity of said cam adapted to oscillate said gear holder equal to the radius difference between said gears, means for maintaining said cam stationary during rotation of said gear.

5. In a portable boring mill, a boring bar, a bearing adapted to rotatably support said boring bar at each of its ends, a bearing fixture at the normally upper end of the boring bar to secure one of said hearings in fixed relationship with an engine cylinder bore, the other of said bearings having a fixture engageable with an engine crankshaft journal, said bearing fixture having means engageable with said journal for aligning the axis of said boring bar at right angles to the axis of an engine crankshaft on which said journal is disposed, a tool carriage longitudinally slidably mounted on said bar, said bar provided with a slot in its side wall, a key fixed to said carriage extending through said slot, a nut on the inner end of said key, a lead screw threadably engaged with said nut internally of said bar, means for rotating said bar in said bearings, a stationary cam, an eccentrically oscillating gear holder engaging said cam, an internal spur gear in said gear holder, and a second gear of smaller diameter in mesh with said internal spur gear and fixed to said lead screw, the eccentricity of said cam adapted to oscillate said gear holder equal to the radius difference between said gears, means for maintaining said cam stationary during rotation of said bar, radial slot means in connection with said bar, and a projecting latch on said gear holder for interengaging the same during rotation of said bar and concurrent rotation and eccentric oscillation of said gear holder.

6. In a portable boring mill, a hollow rotating boring bar, means for rotating the same, a lead screw rotatably mounted in said boring bar, a tool carriage slidable on said boring bar, having means connected therewith threadably engaged with said lead screw, a spur gear on said lead screw, an internal spur gear in mesh with said firstmentioned gear and having greater pitch diameter, a holder for said second-mentioned gear, stationary eccentric cam means adapted to oscillate said gear holder when rotated about the axis of said lead screw, whereby the different diameters of said gears cause said lead screw to be rotationally advanced relative to the rotation of said bar.

'7. In a portable boring mill, a hollow rotating boring bar, means for rotating the same, a lead screw rotatably mounted in said boring bar, a tool carriage slidable on said boring bar, having means connected therewith threadably engaged with said lead screw, a spur gear on said lead screw, an internal spur gear in mesh with said first-mentioned gear and having greater pitch diameter, a holder for said second-mentioned gear, stationary eccentric cam means adapted to oscillate said gear holder when rotated about the axis of said lead screw, whereby the different diameters of said gears cause said lead screw to be rotationally advanced relative to the rotation of said bar, latch means engaging said gear holder with said bar and adapted to reciprocate radially with said gear holder, means for holding said cam stationary against rotation during rotational movement of said bar, and secondary latch means engageable with said means for holding said cam stationary, and connected to said gear holder, whereby said lead screw may be reversed at a rapid rate when said first-mentioned latch means is released from said bar.

8. In a portable boring mill, a hollow rotating boring bar, means for rotating the same, a lead screw rotatably mounted in said boring bar, a tool carriage slidable on said boring bar, having means connected therewith threadably engaged with said lead screw, a spur gear on said lead screw, an internal spur gear in mesh with said first-mentioned gear and having greater pitch diameter, a holder for said second-mentioned gear, stationary eccentric cam means adapted to oscillate said gear holder when rotated about the axis of said lead screw, whereby the different diameters of said gears cause said lead screw to be rotationally advanced relative to the rotation of said bar, latch means engaging said gear holder with said bar and adapted to reciprocate radially with said gear holder, means for holding said cam stationary against rotation during rotational movement of said bar, and secondary latch means engageable with said means for holding said cam stationary, and connected to said gear holder, whereby said lead screw may be reversed at a rapid rate when said first-mentioned latch means is released from said bar, said cam means eccentric equal to the difference in the radius of the pitch diameter of said gears.

MAX BEAULOYE. HENRY BEAULOYE, JR. ALFRED F. BEAULOYE.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 37,384 Chapman Jan. 13, 1863 378,116 Simmon Feb. 21, 1888 452,991 Colburn May 26, 1891 1,241,543 Murphy Oct. 2, 1917 

